6. Safety
The following statement is provided for US customers and references FDA Slit
Lamp Guidance.
Because prolonged intense light exposure can damage the retina, the use of
the device for ocular examination should not be unnecessarily prolonged,
and the brightness setting should not exceed what is needed to provide clear
visualization of the target structures. This device
should be used with filters that eliminate UV radiation (< 400 nm) and,
whenever possible, filters that eliminate short-wavelength blue light (<420
nm).
The retinal exposure dose for a photochemical hazard is a product of the
radiance and the exposure time. If the value of radiance were reduced in half,
twice the time would be needed to reach the maximum
exposure limit.
While no acute optical radiation hazards have been identified for slit lamps, it
is recommended that the intensity of light directed into the patient’s eye be
limited to the minimum level which is necessary for diagnosis. Infants,
aphakes and persons with diseased eyes will be at greater risk. The risk may
also be increased if the person being examined has had any exposure with the
same instrument or any other ophthalmic instrument using a visible light
source during the previous 24 hours. This will apply particularly if the eye has
been exposed to retinal photography.
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